As people’s social life expands, more and more people respond that bad breath seriously affects their social life. Why do you have bad breath even though you brush your teeth twice a day? According to statistics, 80% of people in China suffer from bad breath, although bad breath is not a major disease, but it can bring a lot of trouble to everyone’s normal work and life, leading to others’ boredom and even avoidance, so that patients are depressed and confidence is frustrated. Ninety percent of bad breath is caused by oral problems. Gingivitis, periodontitis, and dental caries may lead to bad breath. Some diseases of the digestive and respiratory systems such as digestive disorders, gastroenteritis, diarrhea, constipation, bronchiectasis, lung infections, etc. can also cause bad breath. In addition, some patients with endocrine diseases such as diabetes can have an odor of rotten apples in their mouth. Most of the bad breath can be relieved by treating oral diseases and proper oral hygiene habits, the following three steps can help you to keep away from bad breath: first step, timely treatment of periodontal disease, dental caries, extraction of irreparable affected teeth and treatment of mouth ulcers; second step back of the tongue cleaning and effective brushing, while using dental floss to fully clean the mouth; third step minimize garlic, curry and other odor-prone foods, and use mouthwash and mouthwash. and use mouthwash and chewing gum etc. to help improve oral odor. Only symptomatic treatment and good oral hygiene habits can keep you away from bad breath and give you a fresh breath.